“The time has come for new immigration rules which say that those seeking admission into our country must be able to support themselves financially and should not use welfare for a period of at least five years,” Trump said at the rally.

The current law does have a few exceptions for veterans, disaster relief and some refugees. It’s unclear if Trump’s proposal would be any different.

The president’s announcement comes as part of his larger campaign promise to crack down on immigration in the U.S. Trump has promised to establish stricter regulations for education and language skills for immigrants allowed into the country.